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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>CHARTS SHOW RIPPABILITY OF ROCK FORMATIONS</title>
      <link>https://trid.trb.org/View/26624</link>
      <description><![CDATA[Charts showing performance of the Kelley KR9 and KR8 Rippers in various materials have been developed by Kelley Products, a division of Crutcher-Rolfs-Cummings, Inc., Houston, Tex. The guides were prepared from actual performance data related to seismic wave velocities. The tables show when a material can be ripped, is marginal or cannot be ripped, based on seismic waves recorded in velocity in feet per second. For instance, the charts reveal that sandstone that has a seismic velocity of from 2,500 to 9,000 feet per second can easily be ripped by a Kelley KR9 on a Cat D9G tractor. With a wave velocity of 9,000 to 11,000 fps, ripping feasibility would be questionable. Seismic wave velocities of more than 11,000 feet per second would signal sandstone material that could not economically be ripped.]]></description>
      <pubDate>Tue, 10 Jun 1975 00:00:00 GMT</pubDate>
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      <title>RFI CAN DETONATE CAPS</title>
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      <description><![CDATA[The problem is discussed and the accident experience is recounted related to electronically emitting equipment which can cause undesired singles, undesired results and potentially deadly responses.  A study is made of the various factors involved, and their relative effects are determined.  Safe practices that will help control the hazard are suggested, and a table is provided of distances from radio frequency transmitters beyond which electric blasting is considered safe.  The use of electric blasting caps, the turning off of radio transmitters in proximity of blasting operations, and the elimination of electric blasting where there is doubt as to the location of power output are suggested.  The variability of the factors involved make it necessary to appraise each individual situation to determine the hazard.]]></description>
      <pubDate>Wed, 26 Mar 1975 00:00:00 GMT</pubDate>
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